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張 旭

Helm | Named Templates - 0 views

helm.sh/...named_templates

helm

shared by 張 旭 on 03 Oct 21 - No Cached
  • a special-purpose include function that works similarly to the template action.
  • when naming templates: template names are global.
  • templates in subcharts are compiled together with top-level templates, you should be careful to name your templates with chart-specific names.
  • ...14 more annotations...
  • One popular naming convention is to prefix each defined template with the name of the chart: {{ define "mychart.labels" }}
  • using the specific chart name as a prefix we can avoid any conflicts
  • But files whose name begins with an underscore (_) are assumed to not have a manifest inside.
  • The define action allows us to create a named template inside of a template file.
  • include it with the template action
  • a define does not produce output unless it is called with a template
  • define functions should have a simple documentation block ({{/* ... */}}) describing what they do.
  • template names are global.
  • A popular naming convention is to prefix each defined template with the name of the chart
  • When a named template (created with define) is rendered, it will receive the scope passed in by the template call.
  • No scope was passed in, so within the template we cannot access anything in .
  • Note that we pass . at the end of the template call. We could just as easily pass .Values or .Values.favorite or whatever scope we want
  • the template that is substituted in has the text aligned to the left. Because template is an action, and not a function, there is no way to pass the output of a template call to other functions; the data is simply inserted inline.
  • use indent to indent
  • 張 旭 on 03 Oct 21
     
    "a special-purpose include function that works similarly to the template action."
張 旭

APP_KEY And You | Tighten - 0 views

tighten.co/app-key-and-you

php laravel

shared by 張 旭 on 21 Jan 22 - No Cached
  • The application key is a random, 32-character string stored in the APP_KEY key in your .env file.
  • Once your app is running, there's one place it uses the APP_KEY: cookies.
  • Laravel uses the key for all encrypted cookies, including the session cookie, before handing them off to the user's browser, and it uses it to decrypt cookies read from the browser.
  • ...16 more annotations...
  • Encrypted cookies are an important security feature in Laravel.
  • All of this encryption and decryption is handled in Laravel by the Encrypter using PHP's built-in security tools, including OpenSSL.
  • Passwords are not encrypted, they are hashed.
  • Laravel's passwords are hashed using Hash::make() or bcrypt(), neither of which use APP_KEY.
  • Crypt (symmetric encryption) and Hash (one-way cryptographic hashing).
  • Laravel uses this same method for cookies, both the sender and receiver, using APP_KEY as the encryption key.
  • something like user passwords, you should never have a way to decrypt them. Ever.
  • Unique: The collision rate (different inputs hashing to the same output) should be very small
  • Laravel hashing implements the native PHP password_hash() function, defaulting to a hashing algorithm called bcrypt.
  • a one-way hash, we cannot decrypt it. All that we can do is test against it.
  • When the user with this password attempts to log in, Laravel hashes their password input and uses PHP’s password_verify() function to compare the new hash with the database hash
  • User password storage should never be reversible, and therefore doesn’t need APP_KEY at all.
  • Any good credential management strategy should include rotation: changing keys and passwords on a regular basis
  • update the key on each server.
  • their sessions invalidated as soon as you change your APP_KEY.
  • make and test a plan to decrypt that data with your old key and re-encrypt it with the new key.
張 旭

Installing Addons | Kubernetes - 0 views

kubernetes.io/...addons

kubernetes network networking

shared by 張 旭 on 25 Jan 23 - No Cached
  • Calico is a networking and network policy provider. Calico supports a flexible set of networking options so you can choose the most efficient option for your situation, including non-overlay and overlay networks, with or without BGP. Calico uses the same engine to enforce network policy for hosts, pods, and (if using Istio & Envoy) applications at the service mesh layer.
  • Cilium is a networking, observability, and security solution with an eBPF-based data plane. Cilium provides a simple flat Layer 3 network with the ability to span multiple clusters in either a native routing or overlay/encapsulation mode, and can enforce network policies on L3-L7 using an identity-based security model that is decoupled from network addressing. Cilium can act as a replacement for kube-proxy; it also offers additional, opt-in observability and security features.
  • CoreDNS is a flexible, extensible DNS server which can be installed as the in-cluster DNS for pods.
  • ...1 more annotation...
  • The node problem detector runs on Linux nodes and reports system issues as either Events or Node conditions.
張 旭

Share Process Namespace between Containers in a Pod | Kubernetes - 0 views

kubernetes.io/...share-process-namespace

kubernetes pod namespace

shared by 張 旭 on 19 Aug 22 - No Cached
  • When process namespace sharing is enabled, processes in a container are visible to all other containers in the same pod.
  • It's even possible to access the file system of another container using the /proc/$pid/root link.
  • Pods share many resources so it makes sense they would also share a process namespace.
  • ...2 more annotations...
  • Processes are visible to other containers in the pod. This includes all information visible in /proc, such as passwords that were passed as arguments or environment variables. These are protected only by regular Unix permissions.
  • Container filesystems are visible to other containers in the pod through the /proc/$pid/root link. This makes debugging easier, but it also means that filesystem secrets are protected only by filesystem permissions.
  • 張 旭 on 19 Aug 22
     
    "When process namespace sharing is enabled, processes in a container are visible to all other containers in the same pod. "
張 旭

Cloudflare outage on June 21, 2022 - 0 views

blog.cloudflare.com/udflare-outage-on-june-21-2022

networking network

shared by 張 旭 on 22 Jun 22 - No Cached
  • This mesh allows us to easily disable and enable parts of the internal network in a data center for maintenance or to deal with a problem.
  • As part of this protocol, operators define policies which decide which prefixes (a collection of adjacent IP addresses) are advertised to peers (the other networks they connect to), or accepted from peers.
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